Photo-induced fluorescence quenching in conjugated polymers dispersed in solid matrices at low concentration
(2014) In Journal of Materials Chemistry C 2(32). p.6601-6608- Abstract
- When isolated conjugated polymer (CP) chains are studied by single molecule spectroscopy, excitation power density in the range of 10-1000 W cm(-2) is normally used. We show that at such excitation power densities the fluorescence ability of CPs is significantly reduced. A new methodological approach allowed us to measure the fluorescence quantum yield (QY) of thin matrix polymer films doped with fluorophores at very low concentration using fluorescence microscopy. Fluorescence QYs of different conjugated polymers (P3HT, MEH-PPV, PFBV and cyclodextrin-coated PFBV-Rtx) and a reference perylene diimide dye dispersed in the PMMA matrix were measured as a function of the excitation power density that ranged from similar to 10(-4) to 100 W... (More)
- When isolated conjugated polymer (CP) chains are studied by single molecule spectroscopy, excitation power density in the range of 10-1000 W cm(-2) is normally used. We show that at such excitation power densities the fluorescence ability of CPs is significantly reduced. A new methodological approach allowed us to measure the fluorescence quantum yield (QY) of thin matrix polymer films doped with fluorophores at very low concentration using fluorescence microscopy. Fluorescence QYs of different conjugated polymers (P3HT, MEH-PPV, PFBV and cyclodextrin-coated PFBV-Rtx) and a reference perylene diimide dye dispersed in the PMMA matrix were measured as a function of the excitation power density that ranged from similar to 10(-4) to 100 W cm(-2). Already at an excitation power of 0.1 W cm(-2) (the power density of the sunlight at the Earth) a detectable reduction of the fluorescence QY was observed for most of the polymers. The origin of the QY reduction is exciton annihilation by photo-generated triplet and/or change-transfer states. Insulation by cyclodextrin was found to decrease significantly the effect of non-emissive quenching states. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4659523
- author
- Sahoo, Dibakar LU ; Tian, Yuxi LU ; Sforazzini, Giuseppe ; Anderson, Harry L. and Scheblykin, Ivan LU
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Materials Chemistry C
- volume
- 2
- issue
- 32
- pages
- 6601 - 6608
- publisher
- Royal Society of Chemistry
- external identifiers
-
- wos:000340216300020
- scopus:84905028125
- ISSN
- 2050-7526
- DOI
- 10.1039/c4tc00831f
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- 86351441-6423-4219-a374-4e652ff88004 (old id 4659523)
- date added to LUP
- 2016-04-01 09:52:33
- date last changed
- 2022-04-19 20:24:57
@article{86351441-6423-4219-a374-4e652ff88004, abstract = {{When isolated conjugated polymer (CP) chains are studied by single molecule spectroscopy, excitation power density in the range of 10-1000 W cm(-2) is normally used. We show that at such excitation power densities the fluorescence ability of CPs is significantly reduced. A new methodological approach allowed us to measure the fluorescence quantum yield (QY) of thin matrix polymer films doped with fluorophores at very low concentration using fluorescence microscopy. Fluorescence QYs of different conjugated polymers (P3HT, MEH-PPV, PFBV and cyclodextrin-coated PFBV-Rtx) and a reference perylene diimide dye dispersed in the PMMA matrix were measured as a function of the excitation power density that ranged from similar to 10(-4) to 100 W cm(-2). Already at an excitation power of 0.1 W cm(-2) (the power density of the sunlight at the Earth) a detectable reduction of the fluorescence QY was observed for most of the polymers. The origin of the QY reduction is exciton annihilation by photo-generated triplet and/or change-transfer states. Insulation by cyclodextrin was found to decrease significantly the effect of non-emissive quenching states.}}, author = {{Sahoo, Dibakar and Tian, Yuxi and Sforazzini, Giuseppe and Anderson, Harry L. and Scheblykin, Ivan}}, issn = {{2050-7526}}, language = {{eng}}, number = {{32}}, pages = {{6601--6608}}, publisher = {{Royal Society of Chemistry}}, series = {{Journal of Materials Chemistry C}}, title = {{Photo-induced fluorescence quenching in conjugated polymers dispersed in solid matrices at low concentration}}, url = {{http://dx.doi.org/10.1039/c4tc00831f}}, doi = {{10.1039/c4tc00831f}}, volume = {{2}}, year = {{2014}}, }